Improvement in book-supporters



R. T. STUDD'ARD Book-Supporter.

Patented Sept. 21,1875.

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m a M m d P a m R Z-w is on flforwaw N-FEIERS, FHOTILLITHOGRAPMER,WASHINGTON. D C.

UNITED STATES FATE a r QFFICE.

RICHARD T. STODDARD, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN BOOK-SUPPORTERS.

Specification forming part of Letters Patent No. 167,951, datedSeptember 21, 1875; application filed I August 2, 1875.

To all whom it may concern Be it known that I, RICHARD T. STODDARD, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Book Supporters; and I dohereby declare that the followingis a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which itpertains to make and use the same, reference being bad to theaccompanying drawing and to the letters of reference marked thereonwhich form a part of this specification.

In the said drawing, Figure 1 is a side elevation, Fig. 2 an endelevation, and Fig. 3 a central and longitudinal section, of abook-supporter embodying m improvement.

My present invention is an improvement upon that for which LettersPatent were granted to me on March 23, 1875, its object being to enablethe device to be applied to shelves of varying thickness with fargreater facility and case than can be effected under the constructionshown in the said patent; and my invention consists in combining withthe spring clamp-plate, a guide-regulating.bar, and pin, by which thelimit of downward movement is controlled, the same being as hereinafterdescribed and claimed.

In the said drawing, A denotes the body of the device, the sameconsisting of a rectangular block of wood or other suitable material,having any desirable length, breadth, and thickness. B is a bentrectangular plate, one end of which, is rigidly secured to the lowerpart of the body A, such plate being arranged underneath such partinparallelism therewith,

and at a distance therefrom a little greater than the thickness of anordinary book-shelf. O is another flat metallic plate, which is disposedbetween the base of the body A and the clamp-plate B, such plate 0having two I cylindrical arms, I) b, projecting upward at right anglesfrom its upper surface, and extending into sockets formed for theirreception in the lower part of the body A, as shown in Fig. 3. Each ofthese arms has a wire or spring coiled around it, such serving to forcethe plate 0 toward the plate B.

In order to counteract an undue movement of the clamp-plate O, as found.in my said patent, I combine with the said plate a slotted bar, D, whichis fixed thereto, and disposed midway between the arms I) I), such barextending up into a socket made vertically in the lower part of the bodyA, as shown in Fig.3. A pin, a, secured to the part A, passestransversely through the slot of the bar D, such slot having a lengthequal to the extent of movement desired to be given to the plate 0, inorder to enable the device to be clamped to shelves of the maximum orminimum thickness, such pin, by the tension of the springs,

mainiainingthe plate() in the position as shown in the drawing, and thusenabling the device to be applied with facility and ease to an ordinarybook-case shelt', whether such be of a greater or less thickness.

Having described my invention, whatIclaim 1s- The combination, with thebody A, the fixed plate B, and the sliding spring-plate O, of theslotted bar D, and pin a, substantially as and for the purpose setforth.

In testimony that I claim the foregoing as my own invention I affix mysignature in presence of two witnesses.

. RIOHD. T. STODDARD. Witnesses:

F. P. HALE, F. O. HALE.

